Response rates among cases and the two control groups; results are number (%)
| No approached | Cases (n=59) | Control type 1 (injury) (n=61) | Control type 2 (non-injury) (n=68) |
|---|---|---|---|
| Could not be located | 7 (11.9) | 10 (16.4) | 13 (19.1) |
| Refused to participate | 5 (8.5) | 2 (3.3) | 2 (2.9) |
| Did not answer telephone | 2 (3.4) | 4 (6.6) | 7 (10.3) |
| Did not speak English | 0 | 0 | 1 (1.5) |
| Responded | 45 (76.7) | 45 (73.8) | 45 (66.2) |